r.what.color.1grass - Man Page
Queries colors for a raster map layer.
Keywords
raster, querying, color table
Synopsis
r.what.color
r.what.color --help
r.what.color [-i] input=string [value=float[,float,...]] [format=string] [--help] [--verbose] [--quiet] [--ui]
Flags
- -i
Read values from stdin
- --help
Print usage summary
- --verbose
Verbose module output
- --quiet
Quiet module output
- --ui
Force launching GUI dialog
Parameters
- input=string [required]
Name of existing raster map to query colors
- value=float[,float,...]
Values to query colors for
- format=string
Output format (printf-style)
Default: %d:%d:%d
Description
r.what.color outputs the color associated with user-specified category values in a raster input map.
Values may be specified either using the values= option, or by specifying the -i flag and passing the values on stdin, one per line.
For each value which is specified, a line of output will be generated consisting of the category value followed by the color, e.g.:
r.what.color input=elevation.dem value=1500 1500: 223:127:31
If the input map is an integer (CELL) map, the category will be written as an integer (no decimal point), otherwise it will be written in floating point format (printf("%.15g") format).
If the lookup fails for a value, the color will be output as an asterisk, e.g.:
r.what.color input=elevation.dem value=9999 9999: *
If a value cannot be parsed, both the value and the color will be output as an asterisk, e.g.:
r.what.color input=elevation.dem value=bogus *: *
The format can be changed using the format= option. The value should be a printf()-style format string containing three conversion specifiers for the red, green and blue values respectively, e.g.:
r.what.color input=elevation.dem value=1500 format=’%02x:%02x:%02x’ 1500: df:7f:1f
If your system supports the %m$ syntax, you can change the ordering of the components, e.g.:
r.what.color input=elevation.dem value=1500 format=’%3$02x:%2$02x:%1$02x’ 1500: 1f:7f:df
Common formats:
- Tcl/Tk: format="#%02x%02x%02x"
- WxPython: format=’"#%02x%02x%02x"’ or format=’"(%d,%d,%d)"’
See Also
r.what
Author
Glynn Clements
Source Code
Available at: r.what.color source code (history)
Accessed: Tuesday Mar 19 11:02:04 2024
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